if not '': #空字符串是假
    print('你看不到我')

file = open('file1.txt',mode='r+',encoding='utf8')

while True:
    text = file.readline()

    if not text:
        break
    print(text,end='')  #默认读取时每一行末尾有/n，为了不输出要加end

"""

"""
